JP2005016241A - Structure of column base part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure of a column base part simple in structure, positively joining a lower end part of a metal pipe column to a column base hardware and relieving stress concentration. <P>SOLUTION: The structure of the column base part comprises the column base hardware 1 of hollow shape formed of a base part 1a fixed to a foundation, and a rising part 1b joined to the metal pipe column 3; and the metal pipe column 3 erected thereon. The metal pipe column with an outer diameter almost equal to the inner diameter of the upper end of the rising part is inserted inside the rising part to join the rising part to the metal pipe column. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

（２）本発明にかかる柱脚部の場合
（接合は、立上り部の上端の鋼管周面と鋼管柱の下端の周面の２カ所の隅肉溶接とする。隅肉溶接の脚長を６ｍｍとする。鋼管柱の挿入深さＬは、（ａ）Ｌ＝１００ｍｍ、（ｂ）Ｌ＝１５０ｍｍの２つのケースとする。）
（ａ）鋼管柱の挿入深さＬ＝１００ｍｍの場合

（ｂ）鋼管柱の挿入深さＬ＝１５０ｍｍの場合

したがって、鋼管柱を柱脚金物の立上り部の内側に挿入することによって、柱脚部の許容曲げモーメントＭは、従来の外側に立設したときと比べて、格段に向上することが分かる。また、鋼管柱の挿入深さを長くすることにより、柱脚部の許容曲げモーメントＭは、格段に向上することが分かる。
【００３２】
【発明の効果】
本発明によれば、構造が簡単で、金属管柱の下端部と柱脚金物を確実に接合できて、かつ応力集中が緩和された柱脚部の構造が得られるので、疲労による亀裂の発生を防止することが可能となる。
【図面の簡単な説明】
【図１】図１は、円形の金属管柱と柱脚金物を示し、（ａ）は横断面図、（ｂ）は縦断面図である。ここで、柱脚金物の立ち上がり部は内面と外面とも円形断面を有し、ベース部は面取りされた矩形板状である。
【図２】図２は、八角形の金属管柱と柱脚金物を示し、（ａ）は横断面図、（ｂ）は縦断面図である。ここで、柱脚金物の立ち上がり部は、内面は八角形断面、外面は円形断面を有する。ベース部は面取りされた矩形板状である。
【図３】図３は、円形の金属管柱と柱脚金物を示し、（ａ）は横断面図、（ｂ）は縦断面図である。ここで、柱脚金物の立ち上がり部は、内面は円形断面、外面は八角形断面を有する。ベース部は面取りされた矩形板状である。
【図４】図４は、円形の金属管柱と柱脚金物を示し、（ａ）は横断面図、（ｂ）は縦断面図である。ここで、柱脚金物の立ち上がり部は内面と外面とも円形断面を有し、ベース部は円形板状である。
【図５】図５は、従来の金属管柱と柱脚金物を示し、（ａ）は横断面図、（ｂ）は縦断面図、（ｃ）は（ｂ）の一部を拡大した図である。
【符号の説明】
１ 柱脚金物
１ａ ベース部
１ｂ 立上り部
１ｃ ボルト孔
１ｄ 嵌合部
２ 基礎
３ 金属管柱
４ アンカーボルト
５ 開先
６ 固定ナット
７ 柱脚金物の立上り部の上端の金属管周面
８ 金属管柱の下端の周面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a column base portion of a metal tube column used for an illumination column, a signal column, a road sign column, and the like.
[0002]
[Prior art]
Lighting columns, signal columns and sign columns are installed on roads and parks, and circular or square metal tube columns are widely used for the columns. Steel pipe columns are generally used as the metal tube columns, and are erected on column bases installed on a foundation such as concrete.
[0003]
Patent Document 1 describes a hollow column base metal formed from a base portion fixed to a foundation and a rising portion joined to a metal tube column.
[0004]
An example of the structure will be described with reference to FIG. 5A and 5B show a metal tube column and a column base metal, wherein FIG. 5A is a transverse sectional view, FIG. 5B is a longitudinal sectional view, and FIG. 5C is an enlarged view of part of FIG.
[0005]
The column base 1 is integrally formed of a base portion 1a fixed to a concrete foundation 2 and a rising portion 1b. The base part is a rectangular plate with a chamfered outer periphery, the center of which forms a circular hole, and together with the rising part, forms a hollow that penetrates the entire interior of the column base metal in the vertical direction. Yes. Bolt holes 1c for passing anchor bolts 4 protruding from the concrete foundation 2 are formed in the base portion 1a. The anchor bolt 4 is fixed by a fixing nut 6.
[0006]
The inside of the rising part 1b is formed in a hollow shape that penetrates in the vertical direction, and together with the base part, forms a hollow that penetrates the entire interior of the column base metal in the vertical direction. The hollow portion inside the column base metal is a place for wiring work such as a cable. The outer diameter of the rising portion is larger at the lower end than the outer diameter of the metal tube column 3 and gradually decreases in the upward direction, and is almost the same as the outer diameter of the metal tube column immediately below the fitting portion 1d at the upper end. Formed identically. The fitting portion is formed on the outer surface of the upper end of the rising portion, and as shown in FIG. 5C, the lower end portion of the metal tube column can be fitted into the outer surface of the upper end portion of the rising portion. ing.
[0007]
Similarly, as shown in FIG. 5C, a lave groove 5 that is continuous in the circumferential direction is formed at the lower end of the fitting portion 1d, and the lower end of the metal tube column is butt welded in the groove 5. Thus, the rising portion and the metal tube column are joined.
[0008]
[Patent Document 1] Japanese Patent Laid-Open No. 2000-336776 [Problem to be Solved by the Invention]
In the structure as described above, the load acting on the column base metal from the metal pipe column is transmitted from the metal tube column to the column base metal bracket only through the fitting portion at the upper end of the column base metal bracket. When subjected to vibration, there is a problem that stress concentration on the fitting portion is likely to occur.
[0009]
Furthermore, this fitting portion has a problem that it has to have a complicated shape because the metal tube column is erected and the lower end of the metal tube column is butted against the upper end of the rising portion of the column base metal. .
[0010]
The present invention has been made to solve the above problems, and has a simple structure, a structure of a column base that can securely join a lower end of a metal tube column and a column base metal, and can reduce stress concentration. The purpose is to provide.
[0011]
[Means for Solving the Problems]
The structure of the column base portion according to the present invention includes a hollow column base metal formed from a base portion fixed to a foundation and a rising portion joined to a metal tube column, and a metal tube erected thereon. It is a structure of a column base composed of a column, and a metal tube column having an outer diameter substantially the same as the inner diameter of the upper end of the rising portion is inserted inside the rising portion, and the rising portion and the metal tube column are joined. It is characterized by that.
[0012]
And it is preferable that the rising part and the metal pipe column are joined by welding of the metal pipe peripheral surface. It is more preferable that the metal pipe peripheral surface at the upper end of the rising portion and the peripheral surface at the lower end of the metal pipe column are joined by welding at two locations.
[0013]
Here, “a metal tube column having an outer diameter substantially the same as the inner diameter of the upper end of the rising portion” means a metal tube having an outer diameter enough to insert and stand the metal tube column on the inner surface of the upper end of the rising portion. Means a pillar.
[0014]
Although there is no restriction | limiting in particular as a metal pipe used for the metal pipe support | pillar which concerns on this invention, A steel pipe, a stainless steel pipe, an aluminum pipe etc. are preferable.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show an example of the structure of the column base according to the present invention.
[0016]
In each of the figures, (a) is a transverse sectional view, and (b) is a longitudinal sectional view. The shape of the metal tube column, the shape of the inner surface and the outer surface of the rising portion of the column base metal, and the shape of the base portion are various.
[0017]
Here, the column base 1 is integrally formed from a base portion 1 a fixed to the concrete foundation 2 and a rising portion 1 b joined to the metal tube column 3.
[0018]
The base portion 1a is formed in a chamfered rectangular plate shape or a disc shape, and a circular or polygonal hole is formed at the center of the base portion, and a hollow that penetrates the entire interior of the column base metal fitting together with the rising portion in the vertical direction. Forming. Bolt holes 1c are formed in the base portion 1a for passing anchor bolts 4 protruding from the upper end portion of the concrete foundation 2. The anchor bolt 4 is fixed by a fixing nut 6.
[0019]
The inside of the rising part 1b is formed in a hollow shape penetrating in the vertical direction. The lower end of the rising part is larger than the outer diameter of the metal tube column on both the inner surface and outer surface, and gradually decreases in diameter as it goes upward, but the shape is independent of the shape of the metal tube column. Design is possible and there are no restrictions.
[0020]
However, the inner surface of the upper end of the rising portion has an inner diameter substantially the same as the outer diameter of the metal tube column 3 so that the metal tube column 3 can be inserted, and is substantially the same as the outer surface shape of the metal tube column 3. Has a shape. For example, when the outer surface shape of the metal tube column 3 is circular, the inner surface at the upper end of the rising portion 1b is also formed in a circular cross-sectional shape having substantially the same inner diameter as the outer diameter of the metal tube column 3 (FIG. 1). When the outer surface shape of the metal tube column 3 is octagonal, the inner surface at the upper end of the rising portion 1b is also formed in an octagonal cross-sectional shape having substantially the same inner diameter as the outer diameter of the metal tube column 3 (FIG. 2). .
[0021]
On the other hand, the outer surface of the upper end of the rising portion needs to be larger than the outer diameter of the metal tube column 3, but the outer surface shape can be designed regardless of the shape of the metal tube column, and there is no restriction. . For example, when the outer surface shape of the metal tube pillar 3 is circular, the outer surface of the rising portion 1b may be circular (FIG. 1) or polygonal (FIG. 3).
[0022]
Moreover, although the chamfered rectangular plate shape or disk shape was illustrated about the shape of the base part 1a, this shape does not have a special restriction | limiting and may be another shape. Moreover, the shape can also be designed irrespective of the shape of the metal tube column, and there is no restriction. For example, when the outer surface shape of the metal tube pillar 3 is circular, the shape of the base portion 1a may be a chamfered rectangular plate shape (FIG. 1) or a disk shape (FIG. 4).
[0023]
Thus, the hollow part inside the column base according to the present invention can make the hole diameter of the base part considerably larger than the diameter of the metal tube pillar, and the rising part can also have a larger lower end. In addition, there are few place restrictions on the wiring work such as cables in the hollow part of the column base.
[0024]
The base portion and the rising portion of the column base metal may be integrally manufactured by forging or casting, or may be manufactured separately and then integrated by welding. The column base hardware according to the present invention is easy to manufacture because the shape of the upper end of the rising portion is simple.
[0025]
Reinforcing ribs may be provided in the horizontal direction or the vertical direction on the inner surface of the rising portion of the column base metal, except for the upper end where the metal tube column is inserted. In any case, the number is not limited. The horizontal reinforcing rib may be provided continuously in the circumferential direction.
[0026]
The diameter of the base portion 1a and the height and diameter of the rising portion 1b are appropriately determined in consideration of the bending stress, shearing force, axial force acting on the column base, and the balance with the metal tube column 3. it can.
[0027]
A column base is formed by inserting the lower end of the metal tube column into the column base hardware manufactured in this way, standing, and joining the rising portion of the column base metal and the metal tube column. The column bases are preferably joined by fillet welding of the circumferential surface of the metal tube. As shown in FIG. 1B, welding can be performed on both the metal pipe peripheral surface 7 at the upper end of the rising portion of the column base metal and the peripheral surface 8 at the lower end of the metal pipe column. Either one of the weldings may be used, but it is more preferable to weld the two points. Fillet welding of the peripheral surface 8 at the lower end of the metal tube column can be performed in the hollow portion inside the column base metal before fixing the base portion to the foundation.
[0028]
This is because when the welding is performed on the two peripheral surfaces of the metal tube column, the stress is dispersed in two locations and in the circumferential direction, the stress concentration is relaxed, and the occurrence of cracks due to fatigue can be prevented.
[0029]
Further, according to the present invention, the lower end of the metal tube column can be inserted long, and accordingly, the load from the metal tube column can be dispersed.
[0030]
【Example】
Here, a steel pipe column is used as the metal column, and the bending moment received by the column base is verified by comparison with a conventional example by inserting the column into the rising portion of the column base metal.
[0031]
The column base of a steel pipe column having a height of 10 m, and the allowable bending moment M of the column base when the outer diameter of the steel pipe column of the column base is 174 mm and the wall thickness is 4.2 mm is It becomes as follows.
(1) In the case of the column base portion according to the conventional example (FIG. 5) (joining is butt welding at the fitting portion at the upper end of the rising portion)

(2) In the case of the column base according to the present invention (joining is performed with fillet welding at two locations, the steel pipe peripheral surface at the upper end of the rising portion and the peripheral surface at the lower end of the steel pipe column. The leg length of the fillet weld is 6 mm. (The insertion depth L of the steel pipe column is assumed to be two cases of (a) L = 100 mm and (b) L = 150 mm.)
(A) When steel pipe column insertion depth L = 100 mm

(B) When the steel tube column insertion depth L is 150 mm

Therefore, it can be seen that by inserting the steel pipe column inside the rising portion of the column base metal, the allowable bending moment M of the column base portion is remarkably improved as compared with the case where the column base is standing outside. Moreover, it turns out that the allowable bending moment M of a column base part improves markedly by lengthening the insertion depth of a steel pipe column.
[0032]
【The invention's effect】
According to the present invention, it is possible to obtain a structure of a column base that has a simple structure, can reliably join the lower end portion of the metal tube column and the column base metal, and has a reduced stress concentration. Can be prevented.
[Brief description of the drawings]
1A and 1B show a circular metal tube column and a column base metal, wherein FIG. 1A is a transverse sectional view and FIG. 1B is a longitudinal sectional view. Here, the rising portion of the column base metal has a circular cross section on both the inner surface and the outer surface, and the base portion is a chamfered rectangular plate shape.
FIGS. 2A and 2B show an octagonal metal tube column and a column base metal, in which FIG. 2A is a cross-sectional view and FIG. 2B is a vertical cross-sectional view. Here, the rising portion of the column base metal has an octagonal cross section on the inner surface and a circular cross section on the outer surface. The base is a chamfered rectangular plate.
FIGS. 3A and 3B show a circular metal tube column and a column base metal, wherein FIG. 3A is a transverse sectional view and FIG. 3B is a longitudinal sectional view. Here, the rising part of the column base metal has a circular cross section on the inner surface and an octagonal cross section on the outer surface. The base is a chamfered rectangular plate.
4A and 4B show a circular metal tube column and a column base metal, in which FIG. 4A is a transverse sectional view, and FIG. 4B is a longitudinal sectional view. Here, the rising portion of the column base metal has a circular cross section on the inner surface and the outer surface, and the base portion has a circular plate shape.
FIGS. 5A and 5B show a conventional metal tube column and column base metal, wherein FIG. 5A is a cross-sectional view, FIG. 5B is a vertical cross-sectional view, and FIG. 5C is an enlarged view of a part of FIG. It is.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Column base 1a Base part 1b Rising part 1c Bolt hole 1d Fitting part 2 Foundation 3 Metal pipe column 4 Anchor bolt 5 Groove 6 Fixing nut 7 Metal pipe peripheral surface 8 of the upper end of the rising part of column base metal 8 Metal pipe column The bottom surface of the

Claims (3)

The structure of the column base is composed of a hollow column base metal formed from a base portion fixed to the foundation and a rising portion joined to the metal tube column, and a metal tube column standing on the hollow column base metal. A column base structure characterized in that a metal tube column having an outer diameter substantially equal to the inner diameter of the upper end of the rising portion is inserted inside the rising portion, and the rising portion and the metal tube column are joined. The structure of the column base part according to claim 1, wherein the rising part and the metal pipe column are joined by welding of the peripheral surface of the metal pipe. The column according to claim 1 or 2, wherein the rising portion and the metal tube column are joined by welding at two locations of the metal pipe peripheral surface at the upper end of the rising portion and the peripheral surface at the lower end of the metal tube column. Leg structure.

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